2.8 Toggle the display of objects as a box of their extents?
To change the same attribute on multiple objects at the same time:


Select all objects
Hover your mouse-pointer over the attribute you want to change
Hold Alt and either enter the new value by selecting from a list like this:

(shown here is the UI of Blender 2.90, but it works the same in older versions.)
Or in other cases with values, click in the field and enter a new value.


After the list was opened with Alt held, or a value selected also while Alt was held, the attribute will be changed for all currently selected objects. This will though not work if you have different types of objects selected that do not share the attribute you want to change, like a few Cubes and a Light for example.

Happy Blending